P0878 Condition 1
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
This DTC sets when reverse range is selected and the TFP switch 4 signal is HIGH for more than 1 second more than 40 times.